<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表头单元格标签</title>
</head>
<body>
    <!-- 这些属性要写到表格标签table 里面去 -->
    <table align="center" border="1" cellpadding="20" cellspacing="0" width="300" height="300">
        <tr><th>姓名</th><th>性别</th><th>年龄</th></tr>
        <tr><td>1号</td><td>男</td><td>20</td></tr>
        <tr><td>2号</td><td>女</td><td>20</td></tr>
        <tr><td>3号啊</td><td>男</td><td>15</td></tr>
    </table>  
</body>
</html>